Khalil Tahmasebi (14 February 1924 – 1955) was a carpenter and member of the Iranian fundamentalist group Fadayan-e Islam ("Self-Sacrificers of Islam"), which has been described as "the first Shiite Islamist organization to employ terrorism as a primary method of political activism." On behalf of this group, Tahmasebi assassinated the Iranian Prime Minister, Ali Razmara, on 7 March 1951.
and was described as a "religious fanatic" by The New York Times.